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/*
* Copyright 2011-2018 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.data.redis.support.atomic;
import java.io.Serializable;
import java.util.Date;
import java.util.concurrent.TimeUnit;
import org.springframework.dao.DataRetrievalFailureException;
import org.springframework.data.redis.connection.DataType;
import org.springframework.data.redis.connection.RedisConnectionFactory;
import org.springframework.data.redis.core.BoundKeyOperations;
import org.springframework.data.redis.core.RedisOperations;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.core.ValueOperations;
import org.springframework.data.redis.serializer.GenericToStringSerializer;
import org.springframework.data.redis.serializer.RedisSerializer;
import org.springframework.lang.Nullable;
import org.springframework.util.Assert;
/**
* Atomic integer backed by Redis. Uses Redis atomic increment/decrement and watch/multi/exec operations for CAS
* operations.
*
* @author Costin Leau
* @author Thomas Darimont
* @author Christoph Strobl
* @author Mark Paluch
* @see java.util.concurrent.atomic.AtomicInteger
*/
public class RedisAtomicInteger extends Number implements Serializable, BoundKeyOperations {
private static final long serialVersionUID = 1L;
private volatile String key;
private final ValueOperations operations;
private final RedisOperations generalOps;
/**
* Constructs a new {@link RedisAtomicInteger} instance. Uses the value existing in Redis or 0 if none is found.
*
* @param redisCounter Redis key of this counter.
* @param factory connection factory.
*/
public RedisAtomicInteger(String redisCounter, RedisConnectionFactory factory) {
this(redisCounter, factory, null);
}
/**
* Constructs a new {@link RedisAtomicInteger} instance.
*
* @param redisCounter Redis key of this counter.
* @param factory connection factory.
* @param initialValue initial value to set if the Redis key is absent.
*/
public RedisAtomicInteger(String redisCounter, RedisConnectionFactory factory, int initialValue) {
this(redisCounter, factory, Integer.valueOf(initialValue));
}
/**
* Constructs a new {@link RedisAtomicInteger} instance. Uses the value existing in Redis or 0 if none is found.
*
* @param redisCounter Redis key of this counter.
* @param template the template.
* @see #RedisAtomicInteger(String, RedisConnectionFactory, int)
*/
public RedisAtomicInteger(String redisCounter, RedisOperations template) {
this(redisCounter, template, null);
}
/**
* Constructs a new {@link RedisAtomicInteger} instance. Note: You need to configure the given {@code template} with
* appropriate {@link RedisSerializer} for the key and value. As an alternative one could use the
* {@link #RedisAtomicInteger(String, RedisConnectionFactory, Integer)} constructor which uses appropriate default
* serializers.
*
* @param redisCounter Redis key of this counter.
* @param template the template.
* @param initialValue initial value to set if the Redis key is absent.
*/
public RedisAtomicInteger(String redisCounter, RedisOperations template, int initialValue) {
this(redisCounter, template, Integer.valueOf(initialValue));
}
private RedisAtomicInteger(String redisCounter, RedisConnectionFactory factory, @Nullable Integer initialValue) {
RedisTemplate redisTemplate = new RedisTemplate<>();
redisTemplate.setKeySerializer(RedisSerializer.string());
redisTemplate.setValueSerializer(new GenericToStringSerializer<>(Integer.class));
redisTemplate.setExposeConnection(true);
redisTemplate.setConnectionFactory(factory);
redisTemplate.afterPropertiesSet();
this.key = redisCounter;
this.generalOps = redisTemplate;
this.operations = generalOps.opsForValue();
if (initialValue == null) {
if (this.operations.get(redisCounter) == null) {
set(0);
}
} else {
set(initialValue);
}
}
private RedisAtomicInteger(String redisCounter, RedisOperations template,
@Nullable Integer initialValue) {
Assert.hasText(redisCounter, "a valid counter name is required");
Assert.notNull(template, "a valid template is required");
Assert.notNull(template.getKeySerializer(), "a valid key serializer in template is required");
Assert.notNull(template.getValueSerializer(), "a valid value serializer in template is required");
this.key = redisCounter;
this.generalOps = template;
this.operations = generalOps.opsForValue();
if (initialValue == null) {
if (this.operations.get(redisCounter) == null) {
set(0);
}
} else {
set(initialValue);
}
}
/**
* Get the current value.
*
* @return the current value.
*/
public int get() {
Integer value = operations.get(key);
if (value != null) {
return value;
}
throw new DataRetrievalFailureException(String.format("The key '%s' seems to no longer exist.", key));
}
/**
* Set to the given value.
*
* @param newValue the new value.
*/
public void set(int newValue) {
operations.set(key, newValue);
}
/**
* Set to the give value and return the old value.
*
* @param newValue the new value.
* @return the previous value.
*/
public int getAndSet(int newValue) {
Integer value = operations.getAndSet(key, newValue);
return value != null ? value : 0;
}
/**
* Atomically set the value to the given updated value if the current value == the expected value.
*
* @param expect the expected value.
* @param update the new value.
* @return {@literal true} if successful. {@literal false} indicates that the actual value was not equal to the
* expected value.
*/
public boolean compareAndSet(int expect, int update) {
return generalOps.execute(new CompareAndSet<>(this::get, this::set, key, expect, update));
}
/**
* Atomically increment by one the current value.
*
* @return the previous value.
*/
public int getAndIncrement() {
return incrementAndGet() - 1;
}
/**
* Atomically decrement by one the current value.
*
* @return the previous value.
*/
public int getAndDecrement() {
return decrementAndGet() + 1;
}
/**
* Atomically add the given value to current value.
*
* @param delta the value to add.
* @return the previous value.
*/
public int getAndAdd(int delta) {
return addAndGet(delta) - delta;
}
/**
* Atomically increment by one the current value.
*
* @return the updated value.
*/
public int incrementAndGet() {
return operations.increment(key).intValue();
}
/**
* Atomically decrement by one the current value.
*
* @return the updated value.
*/
public int decrementAndGet() {
return operations.decrement(key).intValue();
}
/**
* Atomically add the given value to current value.
*
* @param delta the value to add.
* @return the updated value.
*/
public int addAndGet(int delta) {
return operations.increment(key, delta).intValue();
}
/**
* @return the String representation of the current value.
*/
@Override
public String toString() {
return Integer.toString(get());
}
/*
* (non-Javadoc)
* @see org.springframework.data.redis.core.BoundKeyOperations#getKey()
*/
@Override
public String getKey() {
return key;
}
/*
* (non-Javadoc)
* @see org.springframework.data.redis.core.BoundKeyOperations#getType()
*/
@Override
public DataType getType() {
return DataType.STRING;
}
/*
* (non-Javadoc)
* @see org.springframework.data.redis.core.BoundKeyOperations#getExpire()
*/
@Override
public Long getExpire() {
return generalOps.getExpire(key);
}
/*
* (non-Javadoc)
* @see org.springframework.data.redis.core.BoundKeyOperations#expire(long, java.util.concurrent.TimeUnit)
*/
@Override
public Boolean expire(long timeout, TimeUnit unit) {
return generalOps.expire(key, timeout, unit);
}
/*
* (non-Javadoc)
* @see org.springframework.data.redis.core.BoundKeyOperations#expireAt(java.util.Date)
*/
@Override
public Boolean expireAt(Date date) {
return generalOps.expireAt(key, date);
}
/*
* (non-Javadoc)
* @see org.springframework.data.redis.core.BoundKeyOperations#persist()
*/
@Override
public Boolean persist() {
return generalOps.persist(key);
}
/*
* (non-Javadoc)
* @see org.springframework.data.redis.core.BoundKeyOperations#rename(java.lang.Object)
*/
@Override
public void rename(String newKey) {
generalOps.rename(key, newKey);
key = newKey;
}
/*
* (non-Javadoc)
* @see java.lang.Number#intValue()
*/
@Override
public int intValue() {
return get();
}
/*
* (non-Javadoc)
* @see java.lang.Number#longValue()
*/
@Override
public long longValue() {
return get();
}
/*
* (non-Javadoc)
* @see java.lang.Number#floatValue()
*/
@Override
public float floatValue() {
return get();
}
/*
* (non-Javadoc)
* @see java.lang.Number#doubleValue()
*/
@Override
public double doubleValue() {
return get();
}
}
